Mazda RX7. Manual - part 38

FUEL PUMP - ELECTRIC

Article Text (p. 2)

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 05:54PM

RX7 ....................................................... 1.5 (1400)
Pickup ....................................................... .8(800)

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FUEL PUMP

Removal & Installation (B2000)
Disconnect negative battery cable. Unplug connector at fuel
pump. Disconnect inlet and outlet hoses at fuel pump. Remove fuel
pump-to-mounting bracket nuts and remove pump. To install, reverse
removal procedure.

Removal & Installation (RX7)
Remove rear floor mat and disconnect fuel pump electrical
lead. Raise and support vehicle. Remove fuel pump cover. Disconnect
inlet and outlet hoses from pump. Remove fuel pump. To install,
reverse removal procedure.

END OF ARTICLE

HOT IDLE COMPENSATION SYSTEM

Article Text

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 04:59PM

ARTICLE BEGINNING

1983 Exhaust Emission Systems
MAZDA PISTON ENGINE
HOT IDLE COMPENSATION SYSTEM

All Models

DESCRIPTION

The Hot Idle Compensation System supplies additional air to
intake manifold under hot idle conditions to maintain smooth idle and
reduce emissions. A bi-metal valve in air cleaner opens passage from
air cleaner to intake manifold. When this happens, fresh air mixes
with rich air/fuel mixture (caused by sustained idle) and creates
better combustion. Valve opens between 145-160

F (63-71

C).

TESTING

HOT IDLE COMPENSATOR

When engine is cold or air temperature is normal, detach air
hose from intake manifold and try to pull air through with vacuum
pump. No air should pass through compensator. Using a heat lamp, heat
valve to temperature above 155

F (69

C) and try to pull air through

hose. Air should pass through compensator. If not, replace
compensator.

Fig. 1: Mazda Hot Idle Compensator Valve

END OF ARTICLE

IDLE COMPENSATION SYSTEM

Article Text

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 04:59PM

ARTICLE BEGINNING

1983 Exhaust Emission Systems
MAZDA RX7 IDLE COMPENSATION SYSTEM

DESCRIPTION

The Idle Compensation system is installed to control the
air/fuel mixture under varying engine operating conditions. The system
consists of idle compensator, altitude compensator and throttle opener
(air conditioned models).

IDLE COMPENSATOR OPERATION

The idle compensator is a bimetal valve installed in the air
cleaner. The bimetal valve opens at approximately 149

F (65

C) to

supply additional air to intake manifold to lean the air/fuel mixture
for more complete burning.

Fig. 1: Idle Compensator

ALTITUDE COMPENSATOR OPERATION

The altitude compensator is installed on the carburetor to
supply additional air to carburetor during idle mode in high altitude
areas. The altitude compensator stabilizes engine operation.

THROTTLE OPENER OPERATION

AIR CONDITIONED MODELS

The throttle opener consists of air conditioner switch (relay
on manual transmission models), air conditioner solenoid valve, servo

IDLE COMPENSATION SYSTEM

Article Text (p. 2)

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 04:59PM

diaphragm (throttle opener) and connecting hoses and wires. The
throttle opener opens the primary throttle valve when air conditioner
is operated at engine speeds of 1000-1200 RPM to maintain smooth
engine operation.

IDLE COMPENSATOR TEST

Remove air cleaner cover and filter element. When bi-metal
temperature is below 149

F (65

C), valve should be closed and no air

leakage should exist when vacuum is applied to tube. Bi-metal valve
should be open when temperature exceeds 159

F (69

C). If valve does

not function as described, replace valve.

ALTITUDE COMPENSATOR TEST

NOTE: Altitude compensator can only be checked at altitudes of
1640-4920 ft. (500-1500 m).

1) Remove air cleaner and start engine. Engine should idle
smoothly. Place finger over slow port inside carburetor bore (located
on right side of rear bore). With slow port covered, idle speed should
drop.
2) If idle speed does not drop, stop engine and remove
compensator valve. With compensator valve removed, blow through
drilled passages.
3) Air should pass through valve from both passages at
altitudes of 1640-4920 ft. (500-1500 m). If not, replace altitude
compensator valve.

Fig. 2: Altitude Compensator

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